$15a^2-8a^2+a^2$
$\left(2a^3-3a+4\right)\left(2a-1\right)$
$\frac{2}{\cos\left(2x\right)}$
$\frac{d}{dx}5\:\:^x$
$6x^4y+3x^4z$
$-10+-14+2$
$-\left(290\right)-\left(342\right)+\left(-142\right)$
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